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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Conjugated Proteins02:50

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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
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RNA Splicing01:32

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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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RNA Editing02:23

RNA Editing

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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Production and Targeting of Monovalent Quantum Dots
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Quantum Dot-PNA Conjugates for Target-Catalyzed RNA Detection.

Oleksandr Zavoiura1,2,3, Ute Resch-Genger1, Oliver Seitz2

  • 1Division Biophotonics , Federal Institute for Materials Research and Testing (BAM) , Richard-Willstaetter Strasse 11 , 12489 , Berlin , Germany.

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A new enzyme-free assay enables sensitive and reliable detection of RNA using quantum dots and peptide nucleic acid (PNA) probes. This cost-efficient method offers a promising alternative for point-of-care diagnostics.

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Area of Science:

  • Biotechnology
  • Molecular Diagnostics
  • Nanotechnology

Background:

  • Pathogenic nucleic acid detection is vital for disease diagnosis.
  • Current PCR methods are complex and not ideal for point-of-care use.
  • There is a need for sensitive, reliable, and cost-effective diagnostic alternatives.

Purpose of the Study:

  • To develop an enzyme-free assay for fluorometric RNA detection.
  • To utilize semiconductor quantum dots (QDs) and peptide nucleic acid (PNA) probes.
  • To enable simple and inexpensive point-of-care diagnostics.

Main Methods:

  • Developed an enzyme-free assay for RNA detection.
  • Employed target-induced fluorophore transfer onto semiconductor quantum dots (QDs).
  • Utilized PNA probes for selective nucleic acid recognition.

Main Results:

  • Achieved sensitive detection of dengue RNA (10 pM to 100 nM) within 5 hours.
  • Demonstrated reliable detection even with a high excess of noncomplementary RNA.
  • The assay relies on a simple fluorometric readout with inexpensive equipment.

Conclusions:

  • The developed QD-PNA assay is a sensitive, enzyme-free method for RNA detection.
  • This approach offers a cost-efficient and reliable alternative to PCR for diagnostics.
  • The method shows potential for point-of-care applications in disease diagnosis.